KR100648917B1 - Side scan sonar of ship bottom mounted type using multi array transducers and chirp signal - Google Patents

Abstract

The present invention relates to a shipboard underwater ultrasonic flaw detection apparatus using a multiple sound source and chirp signal.

Since the conventional SIDE SCAN SONAR is connected to the ship with a traction signal cable to tow and explores the bottom image, there is always a risk of loss and damage due to cutting of the traction signal cable. It was complicated.

The present invention can eliminate the hull generated noise by using a matched filter (MATCHED FILTER) processing method using a multiple sound source and a chirp signal to solve the above problems in the bottom of the ship instead of conventional traction method The purpose of this is the SIDE SCAN SONAR equipped with multiple sound sources and chirp signals that enable the sea floor to be explored.

Submarine mounted underwater ultrasonic flaw detector using multiple sound sources and chirp signal

Description

Submarine mounted underwater ultrasonic flaw detector using multiple sound source and chirp signal {SIDE SCAN SONAR OF SHIP BOTTOM MOUNTED TYPE USING MULTI ARRAY TRANSDUCERS AND CHIRP SIGNAL}

Figure 1 is an embodiment of the present invention

Figure 2 is a conventional underwater ultrasonic flaw detection

Explanation of symbols for main parts of the drawings

1: ship

2: underwater ultrasonic

3: underwater probe (TOWFISH SONAR)

The present invention relates to a ship mounted underwater ultrasonic flaw detection device using a multiple sound source and chirp signal, characterized by the installation of an underwater ultrasonic wave of multiple sound sources on both sides of the ship bottom rather than the conventional traction method. TOWFISH SONAR).

Until now, the bottom background noise is generated by turbulent noise due to the hull viscosity and propeller's cavity noise and the equipment noise inside the ship's bottom. Underwater ultrasonic waves were installed on both sides of the bottom, so underwater signals could not be obtained.

For this reason, conventionally, the underwater exploration body (3) having an underwater ultrasonic wave is towed to the ship as shown in Fig. 2, so that the problem of the loss or damage of the underwater exploration body (3) due to the cutting of the traction signal cable is eliminated. In addition to this, the communication distance between the TRANSDUCER and the processing unit has a long distance, which leads to various problems such as distortion of the signal, very poor signal transmission, and high operation and maintenance costs.

The present invention is to solve the problems described above, such as the turbulent noise (TUCORRELATE) and the cavity noise (CAVITY NOISE) of the propeller (Propeller) due to the hull viscosity that causes the bottom background noise and equipment noise inside the hull

◎ Noise cancellation by sonar gain effect using multiple sound sources (Hull background noise is not related to sonar signal (UNCORRELATE))

◎ Remove hull background noise using MATCHED FILTER processing method of chirp signal. The sss signal and the hull background noise are uncorrelated. That is, the hull background noise is analyzed by the cause and the noise is removed using the matched filter processing method of the multiple sound source and the chirp signal. It is possible to install the underwater tower equipment by the bottom of the ship.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary view of the present invention.

Using a matched filter processing method of chirp signal (CHIRP) is characterized in that the hull background noise is removed and the sonar 2 is installed on both sides of the bottom of the vessel (1).

In the present invention, the underwater ultrasonic wave 2 is installed at the bottom of the ship.

There is no fear of problems such as loss and damage caused by connecting the existing underwater exploration center or the ship (3) with the ship (1) and the traction line, and can greatly reduce the operation and maintenance costs. Underwater is the communication distance between the transmission and reception unit (TRASDUCER) and the processing unit (PROCESSING) is a very good prevention of signal distortion and transmission of the signal. It is particularly mobile for military purposes.

The present invention improves the hull background noise by the MATCHED FILTER processing method of the multiple sound source and chirp signal, and the underwater ultrasonic wave (2) is mounted on the bottom, so that the underwater probe (3) is lost. And since there is no fear of damage and the communication distance between the transmission unit (TRANSDUCER) and the processing unit (PROCESSING UNIT) is close to prevent distortion of the signal and the signal transmission is very good, there is excellent maneuverability.

Claims (1)

Multiple sound source and chirp signal (MATCHED FILTER) processing method (MATCHED FILTER) processing method to remove the background noise of the hull (1) on both sides of the bottom of the ship (1) by installing an ultrasonic sonar (2) Underwater ultrasonic flaw detector equipped with sound source and chirp signal.

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